Sand-blast device.



- J. E. SWEET, A. WINTER & F. G. CHAMBERS. SAND BLAST DEVICE.

APPLICATION FI'LED OCT. 17, 1913.

l, 170, 1 98. Patented Feb. 1, 1916.

w ass; gs: J/v 1 5 NTORS.

flTrOR/VEY.

JOHN E. SWEET, ANTHONY WINTER, AND FRANK Gr. CHAMBERS, OF SYRACUSE, NEWYORK, ASSIGNORS TO STRAIGHT LINE ENGINE COMPANY, A CORPORATION OF NEWYORK.

SAND-BLAST DEVICE.-

Specification of Letters Patent.

. Patented reb. 1, 1916.

Application filed October 17, 1913. Serial No. 795,739. 4

To all whom it may concern:

Be it known that we, JOHN E. SWEET, AN- THONY WINTER, and FRANK G;CHAMBERS, of Syracuse, in the county of Onondaga, in the State of NewYork, have invented new and useful Improvements in Sand-Blast Devices,of which the following, taken in ery head to such an extent as torequire frequent repairs and in most of the devices now in usenecessitate frequent replacement of the entire delivery head.

The main object of our invention is to render the operation moreeflicient and less expensive by reducing the liability of congestion ofthe sand in the sand condult and by making the parts of the deliveryhead, which are subjected to the most severe wear by abrasion, removableso that they may be replaced by new ones without destroylng ordisplacing the other parts.

Another object is to establish slip connections beween such removableparts and main body of the delivery head so that they may be easily andquickly removed and replaced.

Other objects and uses will be brought out in the following description.

In the drawings Figure 1 is a side elevation of a sand-blast deviceembodying the various features of our invention. Fig. 2 is an enlargedlongitudinal sectional view of the delivery head showing theair-controlling valve in elevation. Fig. 3 is an end View of thedelivery head omitting the aircontrolling valve. Fig. 4 is an enlargedlengthwise sectional view of the sand-receiving head. Fig. 5 is an endview of the head shown in Fig. 4.

As'previously explained, this device is preferably portable and for thispurpose comprises a flexible hose 1 having its opposite ends providedwith a sand-receivsuitable clamp 6'-.

ing head 2 and a delivery head 3-, the flexibility of the hosepermitting either head to be adjusted to any angle or directionaccording to the position of the sand supply or reservoir and objectoperated.

upon.

The sand-receiving head 2 preferably consists of a bulbous tube havingits receivng end tapered for convenience of insertion into the body ofloose sand and its opposite end reduced for the reception of the adacentend of the hose which may be se cured thereto with a tight-slip fit orclamped wlth any well known forms of hose and clamps if necessary.

The intermediate portion of the head is enlarged to form a relativelylarge chamber -4.-'for the purpose of reducing the liability ofcongestion or clogging of the sand after entering the receiving head. Wehave found, however, that this congestion or clogging of the sand may beabsolutely prevented by providing the chamber 4 with an air port orinlet 5 which is prefer- -ably connected to a relatively smallair inlettube 6 running along one side of'the bility of the entrance of sand intothe air duct by careless manipulation of the receiving head into thesand, the free end of the air tube being attached to the hose by a Thishose and its receiving-head 4. may be termed a suction conduit throughwhich the sand is drawn by a rapidly moving current of air passingacross the delivery end of the hose in a manner hereinafter described,and the object in providing the air inlet 5, leading from the atmosphereinto the interior of the chamber '4: is to prevent packing of the sandin the suction conduit by means of the current of air which is drawn bysuction into said conduit through the air inlet to mix with theinflowing sand and cause such sand to pass loosely through the conduit,the same current of air serving to prevent eddying currents of sand atthe junction of the receiving head with the hose.

The delivery head -3 is provided with separate passages 7 and '8converging toward the deli' ery end of the head into a single outletpassage 9' for receiving respectively air under pressure an Sanair-discharge nozzle 11-.

both of which are simultaneously delivered into the outlet 9 at theirpoint of mergence. The air passage -7 is preferably formed centrally ina transverse partition 10 coaxial with the axis of the head and is,therefore, of less diameter than that of the head at opposite ends ofthe partition for receiving the cylindrical portion of an This nozzle isconsiderably longer than the actual thickness of the partition 10 andextends beyond opposite endsthereof, the rear end of the nozzle beingprovided with an outturned annular shoulder 12 while the opposite orfront end is preferably tapered so that the nozzle may be easily andquickly inserted into the passage 7 with a sliding fit and may beadjusted axially to bring its discharge end into proper positionrelatively to the sand passage 8 to produce a higher degree of suctionin the sand pipe or hose. This adjustment may be effected by means of aseries of relatively thin washers -13 surrounding the cylindricalportion of the nozzle 11 between the shoulder 12 and adjacent end faceof the parti' tion 10, thus permitting the discharge end of the airnozzle to be brought to the desired position by simply adding orsubtracting one or more washers, thenozzle being held in its operativeposition by means of a screw nipple 14: on the inner end of the valvecase l5 which is screwed into the adjacent end of the head as shown moreclearly in Fig. 2, the valve casing being provided with a suitable valve16 for controlling theflow of air through the nozzle 11.

The delivery end of the head 3 is provided with an enlarged circularsocket 17- disposed at an angle to the axis of the head in such mannerthat the inner end of the socket is coaxial with said head and with theair discharge nozzle 1l while the outer end is eccentric to said axis,thereby providing one side of the delivery end of the head with a bevelor inclined seat -18 for receiving and partly retaining the innerflaring end of a delivery nozzle -19 through which the air and sand areblown upon the surface of the object which is being treated.

The inner end of the nozzle 19 is additionally held in place against theinclined seat 18 by means of a set screw 20- which is engaged in athreaded aperture in j the opposite side of the head and adapted toengage the corresponding side of the nozzle 19 some distance from itsinner end so that when the nozzle is thus clamped in place, it is firmlyheld against accidental endwise displacement, the inner endof the nozzlebeing adapted to abut against an annular shoulder 21 at the base of thesocket 17 to hold said nozzle against inward displacement while theinclined shoulder l8- and clamping screw 20 serif-e to hold it againstoutward displacement.

It is now clear that when the discharge nozzle 19-- is secured inoperative posi tion in the outer end of the head 3- it is coaxial withsaid head and also with the air discharge nozzle 11-, the passagesthrough both nozzles being preferably tapered outwardly so as to projectair and sand in the form of a jet with considerable force and,therefore, to a considerable distance from the end of the dischargenozzle 19. Both of these nozzles 11 and 19 are preferably made ofhardened metal and capable of resisting to a maximum degree the tendencytoward abrasion thereof by contact of the rapidly moving sand therewithand, in order that the durahility of this portion of the device may befurther increased, the inner end of the discharge nozzle 19 is sorelatively disposed as to bring one side usually the upper side thereofdirectly opposite the inner end of the sand passage 8 so as to receivethe force of impact of the sand in its passage into the head.

We have found that the greatest degree of suction in the sand pipe isproduced by carrying the forward end of the air nozzle nearly or whollyacross the delivery end of the sand pipe at its point of discharge intothe head 3 and it is owing to this fact that the air nozzle ispreferably made of highly hardened metal so as to be capable ofwithstanding to a maximum degree the tendency toward abrasion by theinflowing sand.

The hose 1 is connected to the head 3 by a slip connection through themedium of a nipple 22 which is secured in operative position to the headby means of a set screw 23 as shown more clearly in Fig. 2, said nipplebeing also made of hardened metal to prevent excessive wear by abrasion.

The valve case 15 is provided with a tubular inlet stem 24 adapted to beconnected by a flexible hose or other conduit to any available source ofair supply capable of projecting the air with the desired pressurethrough the head 3 and thereby producing such a degree of suction in thesand pipe or hose 1 as may be necessary to draw the sand therethroughand forcibly eject the same from the nozzle -19 on to the objectoperated upon.

What we claim is:

1.- A sand blast device comprising a threaded air pipe nipple, a tubularhead having one end threaded internally and screwed upon the nipple andits opposite end provided with a socket, the inner end of which isco-axial with the nipple and the outer end eccentric to said axis, atapering 1 let' intermediate its ends at an angle to the i .nozzle inthe socket co-axi-al with said axis,

said head having an inner annular shoulder intermediate its ends and abranch sand inlet opening therein between the annular flange and innerend of the nozzle, and an air nozzle fitted within the annular shoulderand having one end extending partially across. the branch inlet and itsopposite end enlarged and clamped between the annular flangeand adjacentend of the nipple.

2. In a sand blast device, the combination of a tubular head having abranch sand inaxis thereof, said head having an air inlet in one end andits opposite end provided with a socket, the inner end of which iscoaxial with the axis of the head and its outer end eccentric to saidaxis, a tapering delivery nozzle for sand and air having its larger endof substantially the same diameter as the inner end of the socket andfitted therein, and movable means for holding said nozzle in the socketco-axial with the head. I

3. In a sand blast device, the combination of a tubular head having anair inlet in one end and a cylindrical socket in its opposite enddisposed at an angle to the produced axis of the inlet, said head havinga branch sand inlet intermediate its ends at an acute angle with theaxis of the air inlet, a tapering delivery nozzle for sand and airhaving its larger end of substantially the same diameter as the socketand seated in the base thereof co-axial with the air inlet, and movablemeans in one. side of the socket for clamping the nozzle against theopposite side of said socket.

4:. In a sand blast device, the combination of a tubular head having anair inlet in one end and a cylindrical socket in its opposite enddisposed at an angle to the produced axis of the inlet, said head havinga branch sand inlet intermediate its ends at an acute angle with theaxis of the air inlet, a tapering delivery nozzle for sand and airhaving its largerend of substantially the same diameter as'the socketand seated in the base thereof co-axial with the air inlet, movablemeans in one side of the socket for clamping the nozzle ,againsttheopposite side of said socket, and a valve having one end of its caseprovided with a threaded nipple screwing into the air inlet end of thehead.

5. In a sand blast device, the combination of a tubular head having abranch sand inlet in one side intermediate its ends, an air pipe nipplein one end of the head, a transverse partition within the head betweenthe branch sand passage and inlet nipple and provided with a central.openlng co-axial with the air inlet nipple, and a tapering air nozzlefitted in the opening in the partition and having its larger end clampedbetween said partition and nipple.

In'witness whereof we have hereunto set ourhands this 10th day ofOctober, 1913.

J QHN E. SWEET, ANTHONY WINTER, FRANK G. CHAMBERS.

Witnesses: I

W. T. FROMAS, W. T. Pownns.

